Machine for closing paper bags



Feb. 6, 1923. 1 1,444,005

K. OTTING. MACHINE FOR Cwsmc PAPER BAGS.

FILED MAY'12,-192

Fi g. l.

Jnventor:

Patented Feb. 6, 1923.

UNETEE KARL OTTING, OF BERLIN, GERIIIANY,' ASSIGNOR TO THE FIRM:

MASSENVERPACKUNG G. M. B. B1, OF BERLIN, GERMANY.

MASCI-IINEN Fina MACHINE FOR CLOSING PAIPER BAG S.

Application filed May 12, 1921. Serial No. 468,866.

(GRANTED UNDER THE PROVISIGNS OF THE ACT OF MARCH 3, 1921, 41 STAT. In, 1313.)

To 64% whom it may concern.

Be it known that I, KARL OTTING, a citizen of the German Republic, and a resident of Berlin, Germany, have invented certain new and useful Improvements in Machines for Closing Paper (for which I have filed an application in Germany, April 26, 1919), of which the following is a specification.

In bag-filling and closing machines it is difiicult to effecta uniform and neat closure of the closing flap of the bag. In some cases the turning of the bag flap after it has been filled and gummed, is effected by means of bent guide bars the shape of which compels the bag flap to turn over and close during the gradual or step-by-step progression of the turret carrying the filled bags.

During the closing movement the bags are held by grippers and clamping devices grip the bags below the closing place. Such guide bars, however, do not produce a uniformly tight closure of the closing flap. Rather, many of the closed bags have irregular and only partial closures, leaving small gaps at the corners so that the contained material can fall out. The faulty closure of the bags is particularly inconvenient in the case of dusty materials which, in the further transport of the bags, are squeezed out even when the bags are conveyed in a horizontal position.

Folding bars are employed in addition to guide bars for turning over and closing the flaps of the bags. These folding bars serve as abutments for the flaps when the bags carried by the gripping device are moved from underneath along a paste roller from which the flaps take the paste. Behind the paste roller the folding bar is moved in a circle so that it completely returns and presses the flap that has been turned back over it.

Also, with this method of closing, throwouts are unavoidable because the flap of the bag has no positive guidance during the closing movement, and the fold of the flap cannot be previously fixed. Consequently bags are produced having their flaps folded over more or less .crookedly and with partial closure.

Finally, if the-flap of the bag a folded over the edge of the paste vessel, and is at the same time pressed against thepad con-' taining the paste, as is the case in another closing machine, then the edge of the paste j vessel is liable to prevent the paste from reaching right up to the fold of the flap of provided with the fold intended for the closure,independently of the application of the paste and ina position of the bag-carrier preceding said application, and then- 1 only the flaps are provided with the paste. For this purpose the flaps of the bags are turned. sharply over a folding blade that presses against the bags. Owing to the elasticity of the paper the flaps of the bags open during the progression of the turret for the next following operation sufiiciently wide that in further carrying out the invention the paste cannot possibly be applied to the folding flap but only below. the said flap at the place intended for pasting. Consequently, the flaps of the bags cannot become softened by the adhesive and will not warp. It therefore retains its original stifiness and can be folded sharply in the prepared crease.

As the turret continues its movement, the folding of'tlie flap over the crease prepared by the folding blade is effected by means of specialpressing rollers or similar pressing devicesata number of points, so that bags uniformly and tightly closed will drop out at the delivery point of the turret.

The withdrawal of the bags from the magazine and the deliveryof the filled bags to the;closing turret, may be-effected in a known manner by means of a separate filling turret which comprises for the withdrawal. of the bags bag-openers that slip into the bags and present them to the filling hopper.

A constructional example of this invention is illustrated in the accompanying drawings, in whicliz r I I Fig "e 1 is a sideeleva tion thereof;

Figure 2 is a plan,

Figure 3 is apartial sect-ion on the line 3-3 of Figure 2, and

Figure 4 is a side elevation of the paste vessel.

The closing device C comprises in its essential parts .aplate and a canopy n. The plate m is rotated alternatively to the canopy down while the plate in is at rest. Therefore the canopya rests with its shaftn with a roll b on a earn 1) of .a shaft a in bearings of the base plate (Z; The shaft a is driven by any known means for instance a pulley a' Astud (Z' on one bearing of the base plate (Z engages a groove 6 of the shaft a".

so that this shaft may be moved up and down but not rotated. Therotation of the shaft a is further transmitted a bevel gear a to a. locking plate a engaging another plate g having the form of a Maltesecross. A roll f of a crank 6" connected to the plate e engages notches f of the MaL tese-cross g. Thislatter is connected to a hollow shaft m" to which the plate m 1s keyed. Both the cam b and the gear 0, e occupy such a position in regard to each other that the plate m and the canopy 'n can be onlyalternatively moved,

The bags to b closed may be filled and conveyed to the closing device in any known manner for instance by hand or by mechanical means. To receive the filled bags a1 channel-shaped guide trough i is provided on one side ofthe machine in the position I (Fig. 2), belowholders connected to the plate on. In the example shown eight holders 7c are provided according to the eight notches f of the Maltese-cross r In rotating the plate m intothe position I a stop 70 advances the filled bags put in the trough z". I Thefilled bags are put in the trough 2" between the holders is of the plate m and jamming jaws lcflthe levers 7? of which are secured to an axle k of the holders 70. On the axle k is further secured an arm 70*, which on account of the rotation of the plate at comes within reach of a cam 8 fixed on the base plate Thecam s'opens by means of the arm k the Zc and so the filled bags may be placed between the holders in and the jaws 107.. On further rotating the plate m; the stop 7c? carries. the filled bags along and thelatter are pressed by the jaws 7a to the holders in, after the arms is? have become free from the cam a. The pressing 1noveinent being effected by the action of the springs kf, connf'ectedwith one end to the holders 7a and with the other one to the arm is.

a and the latter is moved up and In this position the bag is held during the advance of the closing turret C until the closure has been completed; I I

After the advance of the closing turret through folding blade Z bears against thebags atthe point at which the bag flap is to be folded over.

Thefolding blade Z is carried by a rocking arm Z which is mounted at Z on the base plated and is pulled by a spring 1 into position forfolding. I I

The canopy n is guided vertically above the plate m and carries a number of arms a with folding rollersn The plate m is advanced during the time that the canopy n is stationed in its highest. i H

In the downward movement of the canopy revolution into the position II a 'n it releases the arm Z which in its upper lowerlng the canopy a the head Z becomes free from the roll a and the folding blade Z will be pressed against the bags pressed between the holders 7c and the jaw is by the action of the spring Z 7 I I At the same time the roller n situated above the folding blade [is moved down with the canopy n, and slides from the in cli'ned surface m" ofthe plate at over the? sharp edge of the folding blade Z, whereby it folds the flap of the bags at a sharp angle in the closing direction (Fig.

After the ascent of the canopy it, the roller 91 releases the folded bag flap and further the folding bar 1 is pressed back again by the rollern r I II In the for ard movement of the closing turret C the bag comes into the position III, opposite the paste bex o. In it is mounted a pasting roller 0, which is" rotate d by means of a chain gear 0 and a shaft 0 The. shaft 0 acts also by 'nieans of a cam of upon a pair o'f a'rms' o in the ends of which there is mounted a shaft This shaft carries opposite the closing tur ret. a pasting fillet 79. The shaft is op erated by a tipping ljock, in such a manner that in the return of the arms 0 the shaft sweeps with the pasting fillet p'f, over the roller 0', (as indicated in dotted lines in Fig. 4:) and in nioving forward plaeestlle' pasting fillet 79" vertically so that the latter will transfer the paste to the that is presented to it by the holder k; (shown in run li es, in Fi a) The tipping 100k consists of a Hat s ring 2 folding bl ad e Z connected therewith. I In which holds the square shaft 10 in the determined position but allows it to rock into one or the other of the two positions for re ceiving and applying the paste, into which the shaft 70 is tipped by the two stops 4) and 4) when the roller t, mounted on an arm of the shaft 17, strikes against them in the toand-fro oscillation of the arms 0 The application of the paste is effected directly below the folding crease of the bag flap which, owing to the elasticity of the paper has turned up after folding to such an extent as to allow the pasting fillet p to apply the paste freely to the bags.

After a further advance through g, revolution of the closing turret, the pasted bags are presented in the positions IV, V, VI to other rollers n which during the stoppage of the plate m and during the descent of the canopy .n, slide over the edges formed by the inclined surfaces m and the holders 7c, and thus turn over the creased bag flaps and press them down so as to firmly close the bags.

The pressing down of the bag flap is repeated in the positions V, VI whereby a perfectly secure closure of the bag is effected, since one pressing is often not sufiicient.

Finally, in the position VII, the clamping jaws 7c are pressed by means of a cam 1" acting upon them, which, like the cam s, is situated within the range of the arms 70 that are connected to the clamping jaw levers 70 so that the closed bags can slide into a discharging chute 9.

Having thus particularly described the nature of my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A machine for closing paper bags, comprising, in combination a closing turret adapted and to revolve the bags, gripping-devices attached to said closing turret and adapted to grip the bags below the pasting place, a folding blade, means for turning over the bag-flap in the direction of closure, pressing rollers adapted to effect the turning over movement at a number of successive points during the step-by-step motion of said turret, a paste-receptacle,aroller adapt ed to supply paste from said receptacle, a bar adapted to convey paste from said roller to the pasting place of the bag, and a canopy adapted to move up and down for operating sition and to rotate in step-by-step motion the means for folding and closing the bagfia I 5 A machine for closing paper bags, comprising in combination a closing-turret adapted to revolve the bags, gripping devices attached to said closing turret and adapted to grip the bags below the pastingplace, a folding blade, means for turning over the bag-flap in the direction of closure, a paste-receptacle, a roller adapted to supply paste from said receptacle, a barjournaled in arms adapted to swing between said receptacle and the pasting place, a canopyadapted to move up and down for operating the means for folding and closing the bagflap, for the purpose set forth.

i 3. A machine for closing ing in combination, a closing turret adapted to revolve the bags, gripping-devices attached to said closing turret and adapted to grip the bags below the pasting-place, a folding blade, means for turning over the bag-flap in the direction of closure, a pastereceptacle, a roller adapted to supplypaste from said receptacle, a bar journaled in arms adapted to swing between said receptacle and the pasting'place, a trippinglock adapted to give said bar a reversing motion to take off paste from said roller in one poto give it off to the bag in its bags, comprls- V other position, and a canopy adapted to i move up and down for operating the means for folding and closing the bag-flap, for the purpose set forth; a v.

4:. A machine for closing paper bags, comprising in combination a closing turret adapted to rotate in step-by-step motion and to revolve the bags, gripping-devices at tached to said closing to grip the bags below the pasting-place, a folding blade, means for turning over the bag-flap in the direction of closure, pressing- I rollers adapted to effect said turning over at a number of successive points during the step-by-step motion of said turret, means for applying paste to the bags, and a canopy adapted to move up and down the means for folding and closing the bagfiap, for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

KARL OTTING. Witnesses:

'ELFRIEDE SADGER,

LEO Towns,

turret and adapted for operating I 

